Alyson Hannigan is pregnant with her second child.

The 37-year-old actress and husband Alexis Denisof are said to be delighted to be expecting a new addition to their family, which will be a brother or sister to two-year-old daughter Satyana.

A source told Us Weekly magazine: "Alyson is thrilled to be pregnant. She's been wearing baggy clothes to cover the baby bump."

The 'American Pie' beauty previously said she loved being a mother because it helped fill a "void" in her life, even though she didn't expect it to.

She said: "Being a mother has changed me in every way because my life is so much greater.

"It filled a void I never knew was there. It's the most amazing experience of my life. I just feel so blessed to get to be on this Journey."

Alyson met her British husband on the set of TV show 'Angel' and have been married since 2003.

The flame-haired beauty will return to cinema screens next year for the fourth inception of the 'American Pie' movies, 'American Reunion'.